drivers/video/backlight/ams369fg06.c

   1 /*
   2  * ams369fg06 AMOLED LCD panel driver.
   3  *
   4  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   5  * Author: Jingoo Han  <jg1.han@samsung.com>
   6  *
   7  * Derived from drivers/video/s6e63m0.c
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2 of the License, or (at your
  12  * option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  22  */
  23
  24 #include <linux/wait.h>
  25 #include <linux/module.h>
  26 #include <linux/fb.h>
  27 #include <linux/delay.h>
  28 #include <linux/gpio.h>
  29 #include <linux/spi/spi.h>
  30 #include <linux/lcd.h>
  31 #include <linux/backlight.h>
  32
  33 #define SLEEPMSEC               0x1000
  34 #define ENDDEF                  0x2000
  35 #define DEFMASK                 0xFF00
  36 #define COMMAND_ONLY            0xFE
  37 #define DATA_ONLY               0xFF
  38
  39 #define MAX_GAMMA_LEVEL         5
  40 #define GAMMA_TABLE_COUNT       21
  41
  42 #define MIN_BRIGHTNESS          0
  43 #define MAX_BRIGHTNESS          255
  44 #define DEFAULT_BRIGHTNESS      150
  45
  46 struct ams369fg06 {
  47         struct device                   *dev;
  48         struct spi_device               *spi;
  49         unsigned int                    power;
  50         struct lcd_device               *ld;
  51         struct backlight_device         *bd;
  52         struct lcd_platform_data        *lcd_pd;
  53 };
  54
  55 static const unsigned short seq_display_on[] = {
  56         0x14, 0x03,
  57         ENDDEF, 0x0000
  58 };
  59
  60 static const unsigned short seq_display_off[] = {
  61         0x14, 0x00,
  62         ENDDEF, 0x0000
  63 };
  64
  65 static const unsigned short seq_stand_by_on[] = {
  66         0x1D, 0xA1,
  67         SLEEPMSEC, 200,
  68         ENDDEF, 0x0000
  69 };
  70
  71 static const unsigned short seq_stand_by_off[] = {
  72         0x1D, 0xA0,
  73         SLEEPMSEC, 250,
  74         ENDDEF, 0x0000
  75 };
  76
  77 static const unsigned short seq_setting[] = {
  78         0x31, 0x08,
  79         0x32, 0x14,
  80         0x30, 0x02,
  81         0x27, 0x01,
  82         0x12, 0x08,
  83         0x13, 0x08,
  84         0x15, 0x00,
  85         0x16, 0x00,
  86
  87         0xef, 0xd0,
  88         DATA_ONLY, 0xe8,
  89
  90         0x39, 0x44,
  91         0x40, 0x00,
  92         0x41, 0x3f,
  93         0x42, 0x2a,
  94         0x43, 0x27,
  95         0x44, 0x27,
  96         0x45, 0x1f,
  97         0x46, 0x44,
  98         0x50, 0x00,
  99         0x51, 0x00,
 100         0x52, 0x17,
 101         0x53, 0x24,
 102         0x54, 0x26,
 103         0x55, 0x1f,
 104         0x56, 0x43,
 105         0x60, 0x00,
 106         0x61, 0x3f,
 107         0x62, 0x2a,
 108         0x63, 0x25,
 109         0x64, 0x24,
 110         0x65, 0x1b,
 111         0x66, 0x5c,
 112
 113         0x17, 0x22,
 114         0x18, 0x33,
 115         0x19, 0x03,
 116         0x1a, 0x01,
 117         0x22, 0xa4,
 118         0x23, 0x00,
 119         0x26, 0xa0,
 120
 121         0x1d, 0xa0,
 122         SLEEPMSEC, 300,
 123
 124         0x14, 0x03,
 125
 126         ENDDEF, 0x0000
 127 };
 128
 129 /* gamma value: 2.2 */
 130 static const unsigned int ams369fg06_22_250[] = {
 131         0x00, 0x3f, 0x2a, 0x27, 0x27, 0x1f, 0x44,
 132         0x00, 0x00, 0x17, 0x24, 0x26, 0x1f, 0x43,
 133         0x00, 0x3f, 0x2a, 0x25, 0x24, 0x1b, 0x5c,
 134 };
 135
 136 static const unsigned int ams369fg06_22_200[] = {
 137         0x00, 0x3f, 0x28, 0x29, 0x27, 0x21, 0x3e,
 138         0x00, 0x00, 0x10, 0x25, 0x27, 0x20, 0x3d,
 139         0x00, 0x3f, 0x28, 0x27, 0x25, 0x1d, 0x53,
 140 };
 141
 142 static const unsigned int ams369fg06_22_150[] = {
 143         0x00, 0x3f, 0x2d, 0x29, 0x28, 0x23, 0x37,
 144         0x00, 0x00, 0x0b, 0x25, 0x28, 0x22, 0x36,
 145         0x00, 0x3f, 0x2b, 0x28, 0x26, 0x1f, 0x4a,
 146 };
 147
 148 static const unsigned int ams369fg06_22_100[] = {
 149         0x00, 0x3f, 0x30, 0x2a, 0x2b, 0x24, 0x2f,
 150         0x00, 0x00, 0x00, 0x25, 0x29, 0x24, 0x2e,
 151         0x00, 0x3f, 0x2f, 0x29, 0x29, 0x21, 0x3f,
 152 };
 153
 154 static const unsigned int ams369fg06_22_50[] = {
 155         0x00, 0x3f, 0x3c, 0x2c, 0x2d, 0x27, 0x24,
 156         0x00, 0x00, 0x00, 0x22, 0x2a, 0x27, 0x23,
 157         0x00, 0x3f, 0x3b, 0x2c, 0x2b, 0x24, 0x31,
 158 };
 159
 160 struct ams369fg06_gamma {
 161         unsigned int *gamma_22_table[MAX_GAMMA_LEVEL];
 162 };
 163
 164 static struct ams369fg06_gamma gamma_table = {
 165         .gamma_22_table[0] = (unsigned int *)&ams369fg06_22_50,
 166         .gamma_22_table[1] = (unsigned int *)&ams369fg06_22_100,
 167         .gamma_22_table[2] = (unsigned int *)&ams369fg06_22_150,
 168         .gamma_22_table[3] = (unsigned int *)&ams369fg06_22_200,
 169         .gamma_22_table[4] = (unsigned int *)&ams369fg06_22_250,
 170 };
 171
 172 static int ams369fg06_spi_write_byte(struct ams369fg06 *lcd, int addr, int data)
 173 {
 174         u16 buf[1];
 175         struct spi_message msg;
 176
 177         struct spi_transfer xfer = {
 178                 .len            = 2,
 179                 .tx_buf         = buf,
 180         };
 181
 182         buf[0] = (addr << 8) | data;
 183
 184         spi_message_init(&msg);
 185         spi_message_add_tail(&xfer, &msg);
 186
 187         return spi_sync(lcd->spi, &msg);
 188 }
 189
 190 static int ams369fg06_spi_write(struct ams369fg06 *lcd, unsigned char address,
 191         unsigned char command)
 192 {
 193         int ret = 0;
 194
 195         if (address != DATA_ONLY)
 196                 ret = ams369fg06_spi_write_byte(lcd, 0x70, address);
 197         if (command != COMMAND_ONLY)
 198                 ret = ams369fg06_spi_write_byte(lcd, 0x72, command);
 199
 200         return ret;
 201 }
 202
 203 static int ams369fg06_panel_send_sequence(struct ams369fg06 *lcd,
 204         const unsigned short *wbuf)
 205 {
 206         int ret = 0, i = 0;
 207
 208         while ((wbuf[i] & DEFMASK) != ENDDEF) {
 209                 if ((wbuf[i] & DEFMASK) != SLEEPMSEC) {
 210                         ret = ams369fg06_spi_write(lcd, wbuf[i], wbuf[i+1]);
 211                         if (ret)
 212                                 break;
 213                 } else
 214                         mdelay(wbuf[i+1]);
 215                 i += 2;
 216         }
 217
 218         return ret;
 219 }
 220
 221 static int _ams369fg06_gamma_ctl(struct ams369fg06 *lcd,
 222         const unsigned int *gamma)
 223 {
 224         unsigned int i = 0;
 225         int ret = 0;
 226
 227         for (i = 0 ; i < GAMMA_TABLE_COUNT / 3; i++) {
 228                 ret = ams369fg06_spi_write(lcd, 0x40 + i, gamma[i]);
 229                 ret = ams369fg06_spi_write(lcd, 0x50 + i, gamma[i+7*1]);
 230                 ret = ams369fg06_spi_write(lcd, 0x60 + i, gamma[i+7*2]);
 231                 if (ret) {
 232                         dev_err(lcd->dev, "failed to set gamma table.\n");
 233                         goto gamma_err;
 234                 }
 235         }
 236
 237 gamma_err:
 238         return ret;
 239 }
 240
 241 static int ams369fg06_gamma_ctl(struct ams369fg06 *lcd, int brightness)
 242 {
 243         int ret = 0;
 244         int gamma = 0;
 245
 246         if ((brightness >= 0) && (brightness <= 50))
 247                 gamma = 0;
 248         else if ((brightness > 50) && (brightness <= 100))
 249                 gamma = 1;
 250         else if ((brightness > 100) && (brightness <= 150))
 251                 gamma = 2;
 252         else if ((brightness > 150) && (brightness <= 200))
 253                 gamma = 3;
 254         else if ((brightness > 200) && (brightness <= 255))
 255                 gamma = 4;
 256
 257         ret = _ams369fg06_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);
 258
 259         return ret;
 260 }
 261
 262 static int ams369fg06_ldi_init(struct ams369fg06 *lcd)
 263 {
 264         int ret, i;
 265         static const unsigned short *init_seq[] = {
 266                 seq_setting,
 267                 seq_stand_by_off,
 268         };
 269
 270         for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
 271                 ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]);
 272                 if (ret)
 273                         break;
 274         }
 275
 276         return ret;
 277 }
 278
 279 static int ams369fg06_ldi_enable(struct ams369fg06 *lcd)
 280 {
 281         int ret, i;
 282         static const unsigned short *init_seq[] = {
 283                 seq_stand_by_off,
 284                 seq_display_on,
 285         };
 286
 287         for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
 288                 ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]);
 289                 if (ret)
 290                         break;
 291         }
 292
 293         return ret;
 294 }
 295
 296 static int ams369fg06_ldi_disable(struct ams369fg06 *lcd)
 297 {
 298         int ret, i;
 299
 300         static const unsigned short *init_seq[] = {
 301                 seq_display_off,
 302                 seq_stand_by_on,
 303         };
 304
 305         for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
 306                 ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]);
 307                 if (ret)
 308                         break;
 309         }
 310
 311         return ret;
 312 }
 313
 314 static int ams369fg06_power_is_on(int power)
 315 {
 316         return ((power) <= FB_BLANK_NORMAL);
 317 }
 318
 319 static int ams369fg06_power_on(struct ams369fg06 *lcd)
 320 {
 321         int ret = 0;
 322         struct lcd_platform_data *pd = NULL;
 323         struct backlight_device *bd = NULL;
 324
 325         pd = lcd->lcd_pd;
 326         if (!pd) {
 327                 dev_err(lcd->dev, "platform data is NULL.\n");
 328                 return -EFAULT;
 329         }
 330
 331         bd = lcd->bd;
 332         if (!bd) {
 333                 dev_err(lcd->dev, "backlight device is NULL.\n");
 334                 return -EFAULT;
 335         }
 336
 337         if (!pd->power_on) {
 338                 dev_err(lcd->dev, "power_on is NULL.\n");
 339                 return -EFAULT;
 340         } else {
 341                 pd->power_on(lcd->ld, 1);
 342                 mdelay(pd->power_on_delay);
 343         }
 344
 345         if (!pd->reset) {
 346                 dev_err(lcd->dev, "reset is NULL.\n");
 347                 return -EFAULT;
 348         } else {
 349                 pd->reset(lcd->ld);
 350                 mdelay(pd->reset_delay);
 351         }
 352
 353         ret = ams369fg06_ldi_init(lcd);
 354         if (ret) {
 355                 dev_err(lcd->dev, "failed to initialize ldi.\n");
 356                 return ret;
 357         }
 358
 359         ret = ams369fg06_ldi_enable(lcd);
 360         if (ret) {
 361                 dev_err(lcd->dev, "failed to enable ldi.\n");
 362                 return ret;
 363         }
 364
 365         /* set brightness to current value after power on or resume. */
 366         ret = ams369fg06_gamma_ctl(lcd, bd->props.brightness);
 367         if (ret) {
 368                 dev_err(lcd->dev, "lcd gamma setting failed.\n");
 369                 return ret;
 370         }
 371
 372         return 0;
 373 }
 374
 375 static int ams369fg06_power_off(struct ams369fg06 *lcd)
 376 {
 377         int ret = 0;
 378         struct lcd_platform_data *pd = NULL;
 379
 380         pd = lcd->lcd_pd;
 381         if (!pd) {
 382                 dev_err(lcd->dev, "platform data is NULL\n");
 383                 return -EFAULT;
 384         }
 385
 386         ret = ams369fg06_ldi_disable(lcd);
 387         if (ret) {
 388                 dev_err(lcd->dev, "lcd setting failed.\n");
 389                 return -EIO;
 390         }
 391
 392         mdelay(pd->power_off_delay);
 393
 394         if (!pd->power_on) {
 395                 dev_err(lcd->dev, "power_on is NULL.\n");
 396                 return -EFAULT;
 397         } else
 398                 pd->power_on(lcd->ld, 0);
 399
 400         return 0;
 401 }
 402
 403 static int ams369fg06_power(struct ams369fg06 *lcd, int power)
 404 {
 405         int ret = 0;
 406
 407         if (ams369fg06_power_is_on(power) &&
 408                 !ams369fg06_power_is_on(lcd->power))
 409                 ret = ams369fg06_power_on(lcd);
 410         else if (!ams369fg06_power_is_on(power) &&
 411                 ams369fg06_power_is_on(lcd->power))
 412                 ret = ams369fg06_power_off(lcd);
 413
 414         if (!ret)
 415                 lcd->power = power;
 416
 417         return ret;
 418 }
 419
 420 static int ams369fg06_get_power(struct lcd_device *ld)
 421 {
 422         struct ams369fg06 *lcd = lcd_get_data(ld);
 423
 424         return lcd->power;
 425 }
 426
 427 static int ams369fg06_set_power(struct lcd_device *ld, int power)
 428 {
 429         struct ams369fg06 *lcd = lcd_get_data(ld);
 430
 431         if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
 432                 power != FB_BLANK_NORMAL) {
 433                 dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
 434                 return -EINVAL;
 435         }
 436
 437         return ams369fg06_power(lcd, power);
 438 }
 439
 440 static int ams369fg06_get_brightness(struct backlight_device *bd)
 441 {
 442         return bd->props.brightness;
 443 }
 444
 445 static int ams369fg06_set_brightness(struct backlight_device *bd)
 446 {
 447         int ret = 0;
 448         int brightness = bd->props.brightness;
 449         struct ams369fg06 *lcd = dev_get_drvdata(&bd->dev);
 450
 451         if (brightness < MIN_BRIGHTNESS ||
 452                 brightness > bd->props.max_brightness) {
 453                 dev_err(&bd->dev, "lcd brightness should be %d to %d.\n",
 454                         MIN_BRIGHTNESS, MAX_BRIGHTNESS);
 455                 return -EINVAL;
 456         }
 457
 458         ret = ams369fg06_gamma_ctl(lcd, bd->props.brightness);
 459         if (ret) {
 460                 dev_err(&bd->dev, "lcd brightness setting failed.\n");
 461                 return -EIO;
 462         }
 463
 464         return ret;
 465 }
 466
 467 static struct lcd_ops ams369fg06_lcd_ops = {
 468         .get_power = ams369fg06_get_power,
 469         .set_power = ams369fg06_set_power,
 470 };
 471
 472 static const struct backlight_ops ams369fg06_backlight_ops = {
 473         .get_brightness = ams369fg06_get_brightness,
 474         .update_status = ams369fg06_set_brightness,
 475 };
 476
 477 static int __devinit ams369fg06_probe(struct spi_device *spi)
 478 {
 479         int ret = 0;
 480         struct ams369fg06 *lcd = NULL;
 481         struct lcd_device *ld = NULL;
 482         struct backlight_device *bd = NULL;
 483         struct backlight_properties props;
 484
 485         lcd = kzalloc(sizeof(struct ams369fg06), GFP_KERNEL);
 486         if (!lcd)
 487                 return -ENOMEM;
 488
 489         /* ams369fg06 lcd panel uses 3-wire 16bits SPI Mode. */
 490         spi->bits_per_word = 16;
 491
 492         ret = spi_setup(spi);
 493         if (ret < 0) {
 494                 dev_err(&spi->dev, "spi setup failed.\n");
 495                 goto out_free_lcd;
 496         }
 497
 498         lcd->spi = spi;
 499         lcd->dev = &spi->dev;
 500
 501         lcd->lcd_pd = spi->dev.platform_data;
 502         if (!lcd->lcd_pd) {
 503                 dev_err(&spi->dev, "platform data is NULL\n");
 504                 goto out_free_lcd;
 505         }
 506
 507         ld = lcd_device_register("ams369fg06", &spi->dev, lcd,
 508                 &ams369fg06_lcd_ops);
 509         if (IS_ERR(ld)) {
 510                 ret = PTR_ERR(ld);
 511                 goto out_free_lcd;
 512         }
 513
 514         lcd->ld = ld;
 515
 516         memset(&props, 0, sizeof(struct backlight_properties));
 517         props.type = BACKLIGHT_RAW;
 518         props.max_brightness = MAX_BRIGHTNESS;
 519
 520         bd = backlight_device_register("ams369fg06-bl", &spi->dev, lcd,
 521                 &ams369fg06_backlight_ops, &props);
 522         if (IS_ERR(bd)) {
 523                 ret =  PTR_ERR(bd);
 524                 goto out_lcd_unregister;
 525         }
 526
 527         bd->props.brightness = DEFAULT_BRIGHTNESS;
 528         lcd->bd = bd;
 529
 530         if (!lcd->lcd_pd->lcd_enabled) {
 531                 /*
 532                  * if lcd panel was off from bootloader then
 533                  * current lcd status is powerdown and then
 534                  * it enables lcd panel.
 535                  */
 536                 lcd->power = FB_BLANK_POWERDOWN;
 537
 538                 ams369fg06_power(lcd, FB_BLANK_UNBLANK);
 539         } else
 540                 lcd->power = FB_BLANK_UNBLANK;
 541
 542         dev_set_drvdata(&spi->dev, lcd);
 543
 544         dev_info(&spi->dev, "ams369fg06 panel driver has been probed.\n");
 545
 546         return 0;
 547
 548 out_lcd_unregister:
 549         lcd_device_unregister(ld);
 550 out_free_lcd:
 551         kfree(lcd);
 552         return ret;
 553 }
 554
 555 static int __devexit ams369fg06_remove(struct spi_device *spi)
 556 {
 557         struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
 558
 559         ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
 560         backlight_device_unregister(lcd->bd);
 561         lcd_device_unregister(lcd->ld);
 562         kfree(lcd);
 563
 564         return 0;
 565 }
 566
 567 #if defined(CONFIG_PM)
 568 static unsigned int before_power;
 569
 570 static int ams369fg06_suspend(struct spi_device *spi, pm_message_t mesg)
 571 {
 572         int ret = 0;
 573         struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
 574
 575         dev_dbg(&spi->dev, "lcd->power = %d\n", lcd->power);
 576
 577         before_power = lcd->power;
 578
 579         /*
 580          * when lcd panel is suspend, lcd panel becomes off
 581          * regardless of status.
 582          */
 583         ret = ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
 584
 585         return ret;
 586 }
 587
 588 static int ams369fg06_resume(struct spi_device *spi)
 589 {
 590         int ret = 0;
 591         struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
 592
 593         /*
 594          * after suspended, if lcd panel status is FB_BLANK_UNBLANK
 595          * (at that time, before_power is FB_BLANK_UNBLANK) then
 596          * it changes that status to FB_BLANK_POWERDOWN to get lcd on.
 597          */
 598         if (before_power == FB_BLANK_UNBLANK)
 599                 lcd->power = FB_BLANK_POWERDOWN;
 600
 601         dev_dbg(&spi->dev, "before_power = %d\n", before_power);
 602
 603         ret = ams369fg06_power(lcd, before_power);
 604
 605         return ret;
 606 }
 607 #else
 608 #define ams369fg06_suspend      NULL
 609 #define ams369fg06_resume       NULL
 610 #endif
 611
 612 static void ams369fg06_shutdown(struct spi_device *spi)
 613 {
 614         struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
 615
 616         ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
 617 }
 618
 619 static struct spi_driver ams369fg06_driver = {
 620         .driver = {
 621                 .name   = "ams369fg06",
 622                 .bus    = &spi_bus_type,
 623                 .owner  = THIS_MODULE,
 624         },
 625         .probe          = ams369fg06_probe,
 626         .remove         = __devexit_p(ams369fg06_remove),
 627         .shutdown       = ams369fg06_shutdown,
 628         .suspend        = ams369fg06_suspend,
 629         .resume         = ams369fg06_resume,
 630 };
 631
 632 static int __init ams369fg06_init(void)
 633 {
 634         return spi_register_driver(&ams369fg06_driver);
 635 }
 636
 637 static void __exit ams369fg06_exit(void)
 638 {
 639         spi_unregister_driver(&ams369fg06_driver);
 640 }
 641
 642 module_init(ams369fg06_init);
 643 module_exit(ams369fg06_exit);
 644
 645 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 646 MODULE_DESCRIPTION("ams369fg06 LCD Driver");
 647 MODULE_LICENSE("GPL");